NOAA/WDS Paleoclimatology - Arabian Sea denitrification during the past 1 Ma
This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Paleoceanography. The data include parameters of paleoceanography with a geographic location of Indian Ocean. The time period coverage is from 949300 to 4082 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
- Cite as: Altabet, M.A.; Murray, D.W.; Prell, W.L. (1999-07-01): NOAA/WDS Paleoclimatology - Arabian Sea denitrification during the past 1 Ma. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/n8gg-4d63. Accessed [date].
- Please refer to Credit tab for full citation information.
- doi:10.25921/n8gg-4d63
- noaa-ocean-2536
- NCEI DSI 1200_02
- NCEI DSI 1200_01
noaa-ocean-2536
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | NOAA National Centers for Environmental Information
ncei.info@noaa.gov |
Dataset Point of Contact | Data Center Contact
NOAA World Data Service for Paleoclimatology 828-271-4800 paleo@noaa.gov |
Coverage Description | Date Range: 949300 14C yr BP to 3700 14C yr BP; Date Range: 949300 cal yr BP to 4082 cal yr BP; |
Time Period | -947350 to -2132 |
Spatial Bounding Box Coordinates |
N: 16.625
S: 16.621833
E: 59.861667
W: 59.796
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns
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Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Data update frequency not available |
Supplemental Information |
ABSTRACT SUPPLIED BY ORIGINATOR: Water column and core-top δ15N data show that Arabian Sea denitrification produces large nitrogen isotopic enrichments that are regionally recorded with fidelity in the sediments. These results facilitate interpretation of a 1 m.y. δ15N record for Ocean Drilling Program site 722B on the Owen Ridge in terms of climatically linked oscillations in denitrification at the major orbital periods. As at present, denitrification was greatest during interglacial periods and, apparently, was not active during most glacial intervals. Cross-spectral analysis of δ15N with foraminiferal δ18O (global climate/sea level index) and lithogenic grain size (monsoon strength index) suggests forcings by changes in hydrography and productivity acting through the extent and intensity of the oxygen minimum zone. The data suggest that denitrification may be an internal forcing mechanism for climate change during major glacial/interglacial transitions through influence on marine N inventory and atmospheric CO2. However, compensation or amplification may occur from other sinks (sediment denitrification) or sources (nitrogen fixation).
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Purpose | Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Last Modified: 2024-01-17
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